diff options
| author | Hou Tao <houtao1@huawei.com> | 2023-12-15 18:07:08 +0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-12-15 22:54:55 +0100 |
| commit | 1467affd16b236fc86e1b8ec5eaa147e104cd2a6 (patch) | |
| tree | 4f635246979dbe7796567907dcb483e89297430e | |
| parent | 00cdcd2900bdb9190d1e75438b39cef74cd99232 (diff) | |
selftests/bpf: Add test for abnormal cnt during multi-kprobe attachment
If an abnormally huge cnt is used for multi-kprobes attachment, the
following warning will be reported:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 392 at mm/util.c:632 kvmalloc_node+0xd9/0xe0
Modules linked in: bpf_testmod(O)
CPU: 1 PID: 392 Comm: test_progs Tainted: G ...... 6.7.0-rc3+ #32
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
......
RIP: 0010:kvmalloc_node+0xd9/0xe0
? __warn+0x89/0x150
? kvmalloc_node+0xd9/0xe0
bpf_kprobe_multi_link_attach+0x87/0x670
__sys_bpf+0x2a28/0x2bc0
__x64_sys_bpf+0x1a/0x30
do_syscall_64+0x36/0xb0
entry_SYSCALL_64_after_hwframe+0x6e/0x76
RIP: 0033:0x7fbe067f0e0d
......
</TASK>
---[ end trace 0000000000000000 ]---
So add a test to ensure the warning is fixed.
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231215100708.2265609-6-houtao@huaweicloud.com
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c index 6079611b5df4..05000810e28e 100644 --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c @@ -306,6 +306,21 @@ static void test_attach_api_fails(void) if (!ASSERT_EQ(saved_error, -EINVAL, "fail_5_error")) goto cleanup; + /* fail_6 - abnormal cnt */ + opts.addrs = (const unsigned long *) addrs; + opts.syms = NULL; + opts.cnt = INT_MAX; + opts.cookies = NULL; + + link = bpf_program__attach_kprobe_multi_opts(skel->progs.test_kprobe_manual, + NULL, &opts); + saved_error = -errno; + if (!ASSERT_ERR_PTR(link, "fail_6")) + goto cleanup; + + if (!ASSERT_EQ(saved_error, -E2BIG, "fail_6_error")) + goto cleanup; + cleanup: bpf_link__destroy(link); kprobe_multi__destroy(skel); |